/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.objectweb.asm.util;

import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;

/**
 * An {@link AnnotationVisitor} that checks that its methods are properly used.
 * 
 * @author Eric Bruneton
 */
public class CheckAnnotationAdapter extends AnnotationVisitor {

  private final boolean named;

  private boolean end;

  public CheckAnnotationAdapter(final AnnotationVisitor av) {
    this(av, true);
  }

  CheckAnnotationAdapter(final AnnotationVisitor av, final boolean named) {
    super(Opcodes.ASM6, av);
    this.named = named;
  }

  @Override
  public void visit(final String name, final Object value) {
    checkEnd();
    checkName(name);
    if (!(value instanceof Byte || value instanceof Boolean || value instanceof Character || value instanceof Short || value instanceof Integer
        || value instanceof Long || value instanceof Float || value instanceof Double || value instanceof String || value instanceof Type
        || value instanceof byte[] || value instanceof boolean[] || value instanceof char[] || value instanceof short[] || value instanceof int[]
        || value instanceof long[] || value instanceof float[] || value instanceof double[])) {
      throw new IllegalArgumentException("Invalid annotation value");
    }
    if (value instanceof Type) {
      int sort = ((Type) value).getSort();
      if (sort == Type.METHOD) {
        throw new IllegalArgumentException("Invalid annotation value");
      }
    }
    if (av != null) {
      av.visit(name, value);
    }
  }

  @Override
  public void visitEnum(final String name, final String desc, final String value) {
    checkEnd();
    checkName(name);
    CheckMethodAdapter.checkDesc(desc, false);
    if (value == null) {
      throw new IllegalArgumentException("Invalid enum value");
    }
    if (av != null) {
      av.visitEnum(name, desc, value);
    }
  }

  @Override
  public AnnotationVisitor visitAnnotation(final String name, final String desc) {
    checkEnd();
    checkName(name);
    CheckMethodAdapter.checkDesc(desc, false);
    return new CheckAnnotationAdapter(av == null ? null : av.visitAnnotation(name, desc));
  }

  @Override
  public AnnotationVisitor visitArray(final String name) {
    checkEnd();
    checkName(name);
    return new CheckAnnotationAdapter(av == null ? null : av.visitArray(name), false);
  }

  @Override
  public void visitEnd() {
    checkEnd();
    end = true;
    if (av != null) {
      av.visitEnd();
    }
  }

  private void checkEnd() {
    if (end) {
      throw new IllegalStateException("Cannot call a visit method after visitEnd has been called");
    }
  }

  private void checkName(final String name) {
    if (named && name == null) {
      throw new IllegalArgumentException("Annotation value name must not be null");
    }
  }
}
